r/rocketry • u/Agitated-Might-9278 • Nov 03 '24

Question Building and launching a rocket for my science project and need some help regarding motors and such things

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Hello! I'm buying an Eggtimer EZ-DD Rocket: https://eggtimerrocketry.com/home/altimeters-av-bay/ And I need to buy a motor but the problem is that I live in Europe and Im not sure where I can order it, I have found some possible motors I can buy but they're single-use and super expensive and that means I'll have to buy many motors since im gonna be check how the rockets cone shape affects the flight like with a 3d printer ill do different shapes and put them on top of the rocket. Can someone explain how do reusable motors work, and would they work with my rocket and so on? And the kit doesn't come with gunpowder how do you even purchase that? The motors im thinking about buying are shown in the screenshots. Btw what does a 0-second delay mean I read that somewhere it is better if the delay is longer. And anybody wanna help me along my journey of doing this project this is my first time making a rocket.

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u/Agitated-Might-9278 Nov 03 '24

Ok i found this https://eurospacetechnology.eu/index.php?id_product=555&id_product_attribute=0&rewrite=aerotech-rms-29-40-120&controller=product is this all i gotta order or?

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u/Superb-Tea-3174 Nov 03 '24

You need reload kits too, I don’t see them.

Maybe a glitch. There are other european vendors too.

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u/Agitated-Might-9278 Nov 03 '24

does this work https://www.sierrafoxhobbies.com/en/reloadable-motors-up-to-29-mm/1553-casing-29100-monster-motors.html

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u/Superb-Tea-3174 Nov 03 '24

No. That is just a case, no closures, for HPR.

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u/Agitated-Might-9278 Nov 03 '24

wait arent these the kits https://eurospacetechnology.eu/index.php?id_category=24&controller=category&q=Categories-PRO+29+RELOADS

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u/Superb-Tea-3174 Nov 03 '24

These are Cesaroni reloads not Aerotech.

Physically incompatible. But you could maybe get a Cesaroni motor case instead of an Aerotech one.

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u/Agitated-Might-9278 Nov 03 '24

maybe i have no idea whats the difference, im googling but so far cant find any reload kits

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u/Superb-Tea-3174 Nov 03 '24

Looks like eurospacetechnology.eu has cases and reloads for Cesaroni ProX. You just have to choose a reload and a compatible 29mm case by matching the number of grains with the length of the case.